#include <iostream>
#include <fstream>
#include <vector>

using namespace std;

ifstream fin("sortaret.in");
ofstream fout("sortaret.out");

const int NMax = 50005;
vector < int > v[NMax];
bool go[NMax];

void dfs(int k){
    for(int i = 0; i < v[k].size(); i++){
        if(go[v[k][i]] == false){
            go[v[k][i]] = true;
            fout << v[k][i] << " ";
            dfs(v[k][i]);
        }
    }
}

int main()
{
    int n,m,a,b;
    fin >> n >> m;
    for(int i = 1; i <= m; i++){
        fin >> a >> b;
        v[a].push_back(b);
    }
    for(int i = 1; i <= n; i++){
        if(go[i] == false){
            go[i] = true;
            fout << i << " ";
            dfs(i);
        }
    }
    return 0;
}